Tool head



TOOL HEAD Filed Dec. 17, 1951 3 Sheefcs-Sheet l Z'Smaentor WN A SN Kw\\n WW8 A, A; A) QM.

mw MT (Ittomeg June 12, 1934. Q CONWELL 1,962,951

TOOL HEAD Filed- Dec. 17, 1931 3 Sheets-Sheet 2 2 9 66' 2; .2 i [6 J6 J1 A M J3 c9 16-3: A .24

F I /Q m? (6:

1y Z6 19 0 0 I 19 l l I 26 40 u W k attorney June 12, 1934. c CONWELL1,962,951

TOOL HEAD Filed Dec. 1'7, 1931 3 Sheets-Sheet 3 I ZSnve'ntor Bu a.

(Itfqmeg Patented June 12, 1934 UNITED STA TES' TOOL HEAD Myers 0.Conwell, Milford, Com, minor to Laura E. Conwell, Milford, Conn.

Application December 17, 1931, Serial No. 581,746 r 31 Claims.

This invention is a tool head capable of use in boring, facing,counter-boring, recessing, turning,

spotting, undercutting, back-facing, and like operations in drillpresses, milling machines, boring machines, lathes and other similarpower operated machines.

One of the objects of the invention is to provide a tool head of thecharacter mentioned which will be of compact, simple and'ruggedconstruction, equipped with a tool-carrying cross-slide, and means bywhich radial adjustments of said slide may be under the control of theoperator, at all times while the tool head and the machine spindle arerotating andt-he tool is operating. A further object is to providesimple means for imparting adjusting movements to the tool carryingslide. A further object is to provide means associated with saidadjustment-imparting means by which finer micrometric gradations ofadjustment may be obtained. A further object is to provide simple meansfor preventing accidental change or alteration of the slide adjustmentduring rotation of the-head. A further object is to provide means forlocking the tool or carrier against reciprocable movement at any timeand also for'releasing it at will during rotation of the tool head.

The invention will be hereinafter fully set forth and particularlypointed out in the claims.

In the accompanying drawings:-

Figure 1 is a vertical sectional view illustrating a tool headconstructed in accordance with the invention. Figure 2 is a similar viewat right angles to Figure 1. Figure 3 is a sectional view il lustratinga slight modification. Figure 4 is a diagrammatic view illustrating anarrangement for effecting an automatic feed of the tool. Figure 5 is adiagrammatic view of an arrangement for obtaining a continuous feed.Figure 6 is a tranverse sectional view on line 66, Figure 2, with partsremoved. Figure '7 is a detail plan view illustrating the lock-actuatingring. Figure 8 is a detail view illustrating the resilient support forthe lock-actuating ring. Figure 9 is a detail view illustrating amodification of the lock-actuating ring. Figure 10 is a detail sectionalview illustrating another modification of said ring.

Referring to the drawings, 10 designates a tool body provided with ashank 11, and with an internal chamber 12 which communicates with adiametrically disposed guideway 13 at the lower end thereof. The lowerportion of the guideway is closed by a cap 14 which is provided with athreaded flange l5, removably engaging a complemental threaded portionon the lower end of the body, said flange being cut away as indicated at16 to provide clearance for the reciprocation oi the tool-carrying slideS. Obviously, in order that the cut-away portions 16 may coincide withthe open ends of the guideway 13, as shown inFig. 1, the complementalthreaded portions by which the cap is retained in place mustbe socoordinated that while the cap is completely tightened there will be nooverlapping by the walls of the cutaway portions. Otherwise, freeadjustment of the slide would be impeded.

Encircling the body 10 is a top plate 1'7, normally held in place by alocking nut 18, which in turn is prevented from rotating with respect tothe shank 11 by means of a set screw 19. Said top plate is provided witha key way 1'7 which is engaged by a key 17 carried by body 10, so thatthe top plate will rotate with said body. An undercut portion 20 isformed in said top plate 17, and a similar portion 21 is formed in thelower portion of the body immediately above the guideway 13. Cooperatingwith the said undercut portion 21 is a complemental portion formed inthe lower edge of a stop ring 22 which is normally held from rotation insuitable manner, as for instance, by a stop bar 23, such as is used in atapping chuck. The undercut portions of the body and the stop ringcooperate in a well known manner to provide a ball race for anantifriction bearing.

Interposed between the stop ring 22 and the 1. top plate 17 is anadjusting ring 25, which is provided at its upper edge with an annularrecess 26 formed with angularly disposed intersecting surfaces providinga shoulder, in which is loosely seated a complemental annular ball racemember 2'7 cooperating with the undercut portion 20 of the top plate 17,to provide an antifriction bearing. Said member 2'7 is normally heldagainst rotation with respect to the adjusting ring 25 by means of a pin28, which is supported at its lower end in a portion or the stop ring22.

Said pin also prevents creeping of the ring 2'7 with respect to the topplate 17. It will be noted that the adjusting ring is rotativelysupported with respect to the stop ring and also with respect to thebody 10.

The adjusting ring 25 is internally threaded and engages acorrespondingly threaded actuator member 29 which slidably engages thepin 28, so that it is free for longitudinal reciprocation but is heldagainst rotation with respect to the tool body and the adjusting ring.Slidably mounted upon the body 10 is a hub 30, which is provided with aninternal rack bar 31. Said hub slidably engages the body 10, and isprovided with a key way 30 engaging a key 30 carried by said .body so asto prevent rotation relative thereto. Said hub member is alsooperatively connected with the actuator member 29, so that adjustment ofthe adjusting ring 25 will impart rectilinear movement to the adjustingmember, and its rack bar 31. The hub .30 and the adjusting member 25 maybe operatively connected in any desired manner, but as shown theactuator member is provided with an internal flange 32, which cooperateswith a fixed shoulder 33 on the hub 30 and an adjustable collar 34,engaging said hub, so as to provide ball races in which suitableantifriction members are mounted, as clearly shown in the drawings.

Rotation of the adjusting ring may be readily accomplished byhand, butit is preferred to construct the lower edge thereof with gear teeth 35,which mesh with complemental teeth of a pinion 36, rotatably supportedby the stop ring 22. As shown, the pinion 36 is carried upon a shaft 37mounted in a suitable bearing, and provided with a thumb knob 38 bymeans of which it may be rotated. If desired, the thumb knob may bedispensed with and a star wheel 39 substituted therefor (see Figure 4),and arranged to cooperate with a striker 40 mounted on the top plate, sothat an automatic step-by-step cross feed may be obtained. Obviously therate of feed may be varied by increasing or diminishing the number ofteeth in the star wheel 39 or by varying the number of strikers. Bymeans of this arrangement a valuable and inexpensive accessory for largesize heads on heavy work is provided. The star wheel 39 is preferablymounted on the shaft 37 by any well known friction or other reliefmeans, so as to prevent, jamming of the parts at the end of the tooltravel, should the samabe overlooked.

If desired, a gear 41 may be substituted for the thumb knob (see Figure5), and the same meshed with a normally fixedly positioned, verticallydisposed rack 42. Said rack may be fastened to the work table oranchored to an upper part of the machine that does not move up or down,so that any vertical motion of the head will cause a continuous rotationof the gear and the pinion shaft on which it is mounted, therebyimparting rotation to the adjusting ring and gradually changing thesetting of the tool as the whole head is raised or lowered in boring ahole.- As'shown, the rack is secured to the table, and is provided witha guide bar 43 for holding the gear in engagement -with the rack. Bymeans of this arrangement it is possible to bore a taper hole, taperingin either direction according to which side of the gear the rack ismeshed with. Obviously any sizedgear may be used, depending upon thedegree of taper desired, and the rack may be put on either side of thegear to reverse the direction of feed, i. e. either tioned gear mesheswith a rack- 55 formed in the top of the tool slide Said slideisprovided with set screws 56,- by means of which the shank of a tool maybe engaged and held in place. Suitable antifriction metal 57 may also beprovided to reduce friction upon said slide.

In the form of the invention illustrated in Figure 3, a portion of thetool slide is provided with a tapered opening 58, and the set screws 56are engaged with the shank 59 of an auxiliary tool block 60, which isarranged to carry the boring bar 61 in a horizontal position instead ofvertically, so that large holes may be bored with a small tool head. Acap screw 62 engaging a suitable recess 63 in the auxiliary tool blockalso engages the threaded recess 58,

so as to aid the set screws 56 in retaining the auxiliary tool block inplace.

said head. To accomplish this, the stop ring 22 is provided with aninternal conical seat which is engaged by a pressure ring R having ataper side fitting said seat.

Said pressure ring is split as shown in Figure '7 and normally heldagainst rotation with respect to the stop ring 22 by means of anadjusting screw R carried by the last mentioned ring and projectingbetween the split ends of the pressure ring. Suitable means, such asspring R Figure 8) may be employed to keep the ring R in a normaloperative position. It is obvious that the screw R, being supported bythe stop ring is adjustable while the tool head is rotating, because thestop ring is normally nonrotating. Any advance movement of the screw Rforces the conical end thereof into the split portion of the pressurering R, and causes said ring to expand, so that it will traveldownwardly as viewed in Figures 1 and 2, on the taper seat of the stopring. Said'movement applies pressure to clamping members R. slidablymounted in the tool body, and disposed diagonally so that theirextremities will engage and exert a locking pressure upon the sides ofthe tool slide, thereby preventing sliding movement thereof. A slightreverse movement of the screw R will unlock the slide. I

In lieu of the split ring R and screw R the pressure ring R -may beformed. with a plurality of cam-like teeth or members T, which'areengaged by complemental teeth or members T' carried by the stop ring.See Figure 8.

If desired the pressurering may be provided with anti-friction bearings,as shown in Figure 9. Referring to said figure B designates a groovedball race resting upon the ends of the clamping member R balls B beinginterposed between said race and the bottom of the pressure ring R.

In practice, assuming that the pressure ring R has been adjusted topermit free movement of slide S, all adjustments up to one-thousandthsof an inch are made directly by manual manipulations of the largeknurled adjusting ring 25, while for finer adjustments the milled thumbknob may be used and found more convenient. The micrometer slip collar50 may be set to zero when starting to cut at any point, and by reasonof the fact that it is equipped with a very fine scale, the most minuteadjustments may be made with ease and certainty. If automaticadjustments are desired, either of the arrangements illustrated inFigures 4 and 5 may be employed, as the nature of the work to beperformed may require.

In operation, the desired tool is placed in the tool slide S and lockedby means of the set screws 56, after which the head 10 is rotated in amanner well known and understood in the art. By adjusting the ring 25,the actuator 29 is moved longitudinal-lycf the body, and imparts similarmovements to the hub 30 and the rack member 31, and through theintervening gears 53 and 54, a sliding adjustment of corresponding ratiois imparted to the slide S. In many cases, such asboring a hole in adeep box jig, the stop bar 23 would be in the way. In such instances,the stop bar is removed and the entire tool head permitted to rotate.When an adjustment is required, the operator grasps the adjusting ringand stops it while the body of the head continues to rotate, therebyeilecting a desired adjustment. Or, the stop ring may be grasped andheld stationary with one hand and the adjusting ring manipulated withthe other hand to secure the desired adjus ment. This. however, issomewhat difiicult to do, and where this character of adjustment isdesired, it is preferable to stop' or ho.d the stop ring and make thenecessary adjustments through the thumb knob; after which the parts arereleased, and said parts will once more rotate in unison. After anyadjustment of the ring 25, accidental disturbance of said adjustment isprevented by reason of the pitch of the screw threads connecting saidadjusting ring 25 and the actuator member 29 and because said actuatormember is normally held against rotation by the pin 28. If for anyreason, it is desired that the,tool slide be held in fixed relation withrespect to the tool head, said slide may be quickly locked by a slightadjustment of the screw R It will also be obvious that unlocking of theslide may be instantl effected.

The advantages of the invention will be readily understood by thoseskilled in the art to which it belongs. For instance, it will be notedthat an exceedingly strong and rugged device is provided, which iscapable of use in boring, facing, counterboring, recessing, turning,spotting, undercutting, back-facing and various other similar operationson drill presses, milling machines, boring mi'ls, lathes and the like.An important advantage is that the tool slide may be readily and easilyadjusted during rotation of the tool head and while the tool is cutting,and that simple and efficient means are provided for preventing therotating top plate from affecting or accidenta'ly altering theseadjustments. A further advantage lies in the ease by which the adjustingring may be manipulated either manually or automatically, and thefineness of the obtainable gradations of adjustment. Another andimportant advantage is obtained by the construction of the slideway forthe tool slide, which is not limited in its use to a rotating tool head.A very important advantage of the invention is that by means of thelocking mechanism disclosed, the tool slide may be positively lockedagainst relative movement and quickly released from its lockingmechanism, as occasion-may require. In this connection it will also beobserved that the locking pressure produced by said locking means reactsto produce an additional friction between the stop ringand the adjustingring, tending to prevent rotation of the adjusting ring while thelocking mechanism is in operation.

. Having thus explained the nature of the invention and described anoperative manner of constructing and using the same, although withoutattempting to set forth all of the forms in which it may be made, or allof the forms of its use, what is claimed is:-

1. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said body being rotatable with respect thereto, a top plateconnected with said head and rotatable therewith, an adjusting ringrotatably mounted between said top plate and said stop ring, means forcounteracting the tendency of said body to impart rotations to saidadjusting ring during rotation of the head, means for normallymaintaining said adjusting ring in any of its adjusted positions andmeans operated by said adjusting ring for imparting movements to saidcross-slide.

2. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable'stopring, said bod-y being'rotatable with respect thereto, a top plateconnected with said head and rotatable therewith, an adjusting ringrotatably mounted between said top pate and said stop ring, a bear-. ingmember interposed between the top plate and said adjusting ring andloosely engaging said ring, means for preventing rotative movement of"said bearing member, means for normally maintaining said adjusting ringin any of its adjusted positions and means operated by said adjustingring for imparting movements to said cross-slide.

3. A tool head of the character described comprising a body, across-slide rcciprocably mounted therein, a normally non-rotatable stopring,

said body being rotatable with respect thereto,

cess in its upper edge, an annular bearing member loosely fitting saidrecess, means for preventing rotation of said bearing member, means fornormally maintaining said adjusting ring in any of its adjustedpositions and means operated by said adjusting ring for impartingmovements to said cross-slide.

4. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring,

said body being rotatable with respect thereto,

a top plate connected to said head so as to retate therewith; anadjusting ring rotatablymounted between said top plate and said stopring, said adjusting ring having an annular recess in its upper edge, abearing member complemental to and loosely fitting said recess, meansconnected with the stop ring for preventing rotative movement of thebearing member, means for normally maintaining said adjusting ring inany of its adjusted positions and meansv operated by the adjusting ringfor imparting movements to said cross-slide.

5. A tool head of the character described comprising a'body, across-slide 'reciprocably mount said body being rotatable with respectthereto, an adjusting ring rotatably mounted with respect to said stopring, a hub slidably engaging said body, said hub and said body havingcomplemental means for preventing relative rotation, so lv that the hubwill rotate with said body, an actuator member operated by said ring andmovable longitudinally of the'body, and having an operative connectiontherewith constructed and ed therein, a normally non-rotatable stopring, 1146 arranged to impart movement to the hub, said 9 connectingmeans permitting rotation of the hub with respect to said actuatormember, means for preventing rotation of said actuator member, meansoperatively connecting the actuator member and the adjusting ring, saidmeans being constructed and arranged to prevent accidental movement ofsaid adjusting ring, and means operated by said hub for imparting.movements to said cross-slide.

6. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said body being rotatable with respect thereto, a top platerotatable with said head, a rotatably mounted adjusting ring betweensaid top plate and said stop ring, a bearing member loosely engaging theupper part of said adjusting ring and interposed between it and said topplate, an actuator member operated by said adjusting member, a pinanchored to said stop ring and engaging. said actuator member and saidbearing parting movements to said cross-slide.

7. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said body being rotatable with respect thereto, an adjusting ringrotatably mounted with respect to said stop ring, a hub slidablyengaging said body, said hub and said body having com-' plemental meansfor preventing relative rotation, so that the hub will rotate with saidbody, a rack bar supported by said hub, an actuator member engagingsaid-adjusting ring and enclosing the hub, said actuator and said hubhaving complemental means connecting them, so that longitudinal movementof the actuator member imparts corresponding movement to the hub, saidconnecting means permitting rotation of the hub with respect to theactuator member, said connecting means being so constructed and arrangedas to prevent accidental movement of said adjusting ring, means forpreventing rotation of said actuator member, and means operated by saidrack bar for imparting movements to said cross-slide.

8. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said body being rotatable with respect thereto, a rotatablymounted adjusting ring movable with respect to said stop ring and alsowith respect to said body, means for counteracting the tendencyof theadjusting ring to rotate under influence of the rotation of said body,said body and said adjusting ring being movable relative to said means,

a hub slidably mounted on said body and connected to rotate therewith,means operated by said adjusting ring for imparting slidable movement tosaid hub, means for preventing accidental movement of said adjustingring and means operated by movements of said hub for imparting movementsto said cross-slide.

' 9. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said tion of said actuator member but permitting 1ongitudinalmovement thereof, said last mentioned means being constructed andarranged to prevent accidental movement of said adjusting ring, a hubmember enclosed Within said actuator member and provided with an annularshoulder and an adjustable collar, said actuator member having a flangeprojected between said shoulder and said collar, and means operated bysaid actuator member for imparting movements to said crossslide.

10. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said body being rotatable with respect thereto, an adjusting ringrotatably mounted with respect to said stop ring and also with respectto said body,

\ said adjusting ring being internally threaded, a threaded actuatormember engaging the threaded portion of said adjusting ring and havingan internal annular rib, a hub enclosed within the actuator member andhaving means rotatively engaging said rib but including meanscooperating with said rib for preventing relative longitudinal movementof the hub and'the actuator member, means preventing rotative movementof said actuator member but permitting longitudinal movement thereof,said last mentioned means being constructed and arranged to preventaccidental movement of said adjusting ring, a rack member carried bysaid hub, andmeans operated by said rack member for imparting movementto said.

cross-slide.

11. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said body being rotatable with respect thereto, an adjusting ringrotatably mounted with respect to said stop ring and also with respectto said body, said adjusting ring being internally threaded, saidadjusting ringbeing provided with gear teeth, a pinion engaging saidteeth, said pinion being rotatably supported by said stop rin means forrotating said pinion so as to impart movement to the adjusting ring,means for normally preventing accidental movement of said adjusting ringand means operated by the adjusting ring for imparting movements to saidcross-slide.

12. A tool head of the character described comprising a body, across-slide reciprocably mounted therein, a normally non-rotatable stopring, said body being rotatable with respect thereto, an adjusting ringrotatably mounted with respect to said stop ring and also with respectto said body, said adjusting ring being internally threaded, amicrometer ring rotatably mounted upon said adjusting ring, means fornormally preventing relative' rotations of the micrometer ring and saidadjusting ring, means for imparting movement to said adjusting ring,means for normally preventing accidental movement of said adjusting ringand means operated by said adjusting ring for imparting movement to saidcross-slide.

13. A tool of the character described comprising a body, a cross-slidereciprocably mounted therein, a normally non-rotatable stop ring, saidbody being rotatable with respect thereto, an adjusting ring rotatablymounted with respect to said stop ring and also with respect to saidbody, means operated by said adjusting ring for imparting movements tosaid cross-slide, means for normally preventing accidental movement ofsaid adjusting ring and means for imparting rotative adjustments to saidadjusting ring.

14. A tool of the character described comprising a body, a cross-slidereciprocably mounted therein, a normally nonrotatable stop ring, saidbody being rotatable with respect thereto, an

adjusting ring rotatably mounted with respect to said stop ring and alsowith respect to said body, means operated by said adjusting ring forimparting movements to said cross-slide, means for normally preventingaccidental movement of said adjusting ring and means for impartingstep-bystep rotative movements to said adjusting ring.

15. A tool of the character described comprising a body, a cross-slidereciprocably mounted therein, a normally non-rotatable stop-ring, saidjusting ring rotatably mounted with respect to said stop ring and alsowith respect to said body, means operated by said adjusting ring forimparting movements to said cross-slide, a shaft for actuating saidadjusting ring, an actuator member connected with said shaft, means forimparting step-by-step movements to said shaft, and means for normallypreventing accidental movement of said adjusting ring, 16. A tool of thecharacter described comprising a body, a cross-slide reciprocablymounted therein, a normally non-rotatable stop-ring, said body beingrotatable with respect thereto, an

adjusting ring rotatably mounted with respect to said ring and also withrespect to said body, means operated by said adjusting ring forimparting movements to said cross-slide, means for imparting acontinuously progressive rotative movement to said adjusting ring, andmeans for normally preventing accidental movement of said adjustingring.

17. A tool of the character described comprising a body, a cross-slidereciprocably mounted therein, a normally non-rotatable stop-ring, saidbody being rotatable with respect thereto, an adjusting ring rotatablewith respect to said stopring and also with respect to said body, meansoperated by said adjusting ring for imparting movements to saidcross-slide, a shaft for actuating said adjusting ring, an actuatormember connected with said shaft, means for imparting a continuousrotation to said shaft in a predetermined direction, and means fornormally preventing accidental movement of said adjusting ring.

18. In a tool of the character described, a body, a cross-slidereciprocably mounted therein, means for imparting slidable adjustmentsto said slide during rotations of said body, a pressure ring normallyoccupying a fixed position, means for adjusting said ring, andslide'engaging members operatively associated with said pressure ring.

19. In a tool of the character described, a body, a cross-slidereciprocably mounted therein, means for imparting slidable adjustmentsto said slide during rotations of said body, a stop ring, a splitpressure ring adjustably engaging said stop ring, slide-engaging membersoperatively associated with said ring, and means for expanding saidsplit pressure ring so as to apply pressure upon said slide-engagingmembers.

20. In a tool of the character described, a body, a cross-slidereciprocably mounted therein, means for imparting slidable adjustmentsto said slide during rotations of said body, a stop ring having aninclined surface portion, a split pressure ring having an inclined facebearing upon.

said inclined surface, an adjusting screw mounted body being rotatablewith respect thereto, an adin said step ring and engaging said pressurering,-

and slide-engaging members associated with said pressure ring.

21. In a tool of the character described, a body, a cross-slidereciprocablymounted therein, means for imparting slidable adjustments tosaid slide during rotations of said body, a stop ring having an inclinedsurface portion, a split pressure ring having an inclined face bearingupon said inclined surface, an adjusting screw mounted in said stop ringand having one end engaging the split portion of said pressure ring, andslideengaging members operated by said pressure ring.

22. A tool head of the character described comprising a body, a normallynon-rotatable stop ring, said body being rotatable with respect thereto,a cross slide reciprocably supported by said body and mounted to conformto rotative movements thereof, a rotatable adjusting ring freely movablewith respect to said stop ring and said body, means connected with saidstop ring for counteracting the tendency of. said adjusting ring torotate with said body, means car- 'ried by said body for reciprocativelyadjusting said cross slide, and means interposed between said adjustingring and said cross slide adjusting means for maintaining an operativeconnection between them at all times.

23. In a tool of the character described, a body, a cross slidereciprocably mounted in said body, means for imparting rectilinearadjustments to said slide during rotation of said body, a non-rotatablestop ring, and means cooperating with said stop ring for normallylocking said slide against movement.

24. In a tool of the character described, a body, a cross slidereciprocably mounted in said body, means for imparting rectilinearadjustments to said slide, locking means for normally holding said slideagainst movement, a friction member cooperating with said ring andcontrolling said locking means, and means .carried by said stop ring foradjusting said friction member.

25. In a tool of the character described, a tool body, a cross slidereciprocably mounted in said body, means for imparting rectilinearadjustments to said slide, a stop ring, a friction ring, said. ringshaving complemental reacting surfaces, means for adjusting said frictionring so as to cause said reacting surfaces to impart movement to thefriction ring, and means controlled by the friction ring for lockingsaid slide.

26. In a tool of the character described, a tool body, a cross slidereciprocably mounted in said body, means for imparting rectilinearadjustments to said slide, an expansible friction ring of resilientmaterial, means for expanding said ring, locking members mounted in thebody and positioned to engage said slide, and means for causing saidring to apply pressure upon said looking members as it is expanded.

27. In a tool of the character described, a tool body, a cross slidereciprocably mounted therein, means for imparting rectilinearadjustments to said slide, means for locking said slide againstmovement, a friction ring, and means operable during rotation of saidbody for adjusting said friction ring toward and from said lockingmeans, so as to apply or remove pressure from said locking means.

28. In a tool of the character described, a tool body having an internalopen ended transversely disposed guideway, said body having externalscrew threads, a cap having a flange provided with an internal screwthread complemental to 15o lower portion having an external screwthread, a cap having an internally threaded annular flange for engagingthe threaded portion of said body, said flange having opposite openingstherein registering with the ends of said guideway, said threads beingso coordinated that while the cap is completely tightened the openingsin said flange will register with the ends of the guideway, a crossslide movably mounted in said guideway and the openings in said flange,and means for adjusting said slide.

30. The combination with a tool body having a cross slide reciprocablymounted therein, said slide having a vertically disposed recess therein,a supplemental auxiliary tool block having a shank constructed to fitwithin .said recess,

means for clamping said shank within said recess, and means in additionto said clamping means for securing said auxiliary block to said slide,said auxiliary block having a tool-receiving chamber parallel with saidslide.

31. The combination with a tool body and a cross slide reciprocablymounted therein, said slide having a vertically disposed recess therein,of a complemental auxiliary tool block having a-shank constructed to fitinto said recess, means for clamping said shank within said recess, saidauxiliary tool block having a tool-receiving chamber parallel with saidslide and a recess in said last mentioned tool-receiving chamber,andmeans in the last mentioned recess for additionally securing saidauxiliary tool block to said guide.

MYERS C. CONWELL.

